20770547757 has 4 divisors (see below), whose sum is σ = 27694063680. Its totient is φ = 13847031836.

The previous prime is 20770547753. The next prime is 20770547767. The reversal of 20770547757 is 75774507702.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20770547757 - 2² = 20770547753 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20770547753) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3461757957 + ... + 3461757962.

It is an arithmetic number, because the mean of its divisors is an integer number (6923515920).

Almost surely, 2^20770547757 is an apocalyptic number.

It is an amenable number.

20770547757 is a deficient number, since it is larger than the sum of its proper divisors (6923515923).

20770547757 is an equidigital number, since it uses as much as digits as its factorization.

20770547757 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6923515922.

The product of its (nonzero) digits is 3361400, while the sum is 51.

The spelling of 20770547757 in words is "twenty billion, seven hundred seventy million, five hundred forty-seven thousand, seven hundred fifty-seven".